CN211556028U - Lithium ion battery core pack and lithium ion battery - Google Patents
Lithium ion battery core pack and lithium ion battery Download PDFInfo
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- CN211556028U CN211556028U CN201922502390.3U CN201922502390U CN211556028U CN 211556028 U CN211556028 U CN 211556028U CN 201922502390 U CN201922502390 U CN 201922502390U CN 211556028 U CN211556028 U CN 211556028U
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- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 53
- 238000003466 welding Methods 0.000 claims abstract description 214
- 239000000084 colloidal system Substances 0.000 claims abstract description 34
- 239000003292 glue Substances 0.000 claims abstract description 29
- 239000002985 plastic film Substances 0.000 claims abstract description 20
- 229920006255 plastic film Polymers 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 238000007711 solidification Methods 0.000 claims description 24
- 230000008023 solidification Effects 0.000 claims description 24
- 239000003792 electrolyte Substances 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 17
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000002893 slag Substances 0.000 abstract description 28
- 238000000576 coating method Methods 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 19
- 230000001070 adhesive effect Effects 0.000 description 19
- 239000002390 adhesive tape Substances 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000003475 lamination Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to a lithium ion battery preparation field discloses a lithium ion battery core package and lithium ion battery. Wherein lithium ion battery core package including positive plate, negative pole piece and interval diaphragm between adjacent positive plate and negative pole piece, stretches out on the lithium ion battery core package and has anodal ear welding part, negative pole ear welding part weld respectively on the surface anodal ear, negative pole ear with the surface coating in the seal district that welds of anodal ear welding part, negative pole ear welding part has the glue solution, the glue solution solidify into with the colloid that the seal district combines into an organic whole, it closely coats in the colloid to weld the seal district. By applying the technical scheme, the protection of the welding area of the lug welding part is favorably improved, the welding slag at the welding area is prevented from corroding the welding area and puncturing high-temperature glue, the short circuit caused by the fact that the welding slag falls off and the welding slag or burrs puncture the inner-layer aluminum-plastic film and the like is avoided, and the safety and the stability of the lithium ion battery are further improved.
Description
Technical Field
The utility model relates to a lithium ion battery preparation field discloses a lithium ion battery core package and lithium ion battery.
Background
Along with the popularization of the global environmental protection concept, the new energy electric vehicle gradually enters the mass market, and how to improve the safety performance of the new energy electric vehicle becomes an industrial technical problem. A laminated lithium ion battery is used as a main standard of the lithium ion battery, wherein the lamination is mainly to die cut a positive plate and a negative plate into a size with a specified size, then the positive plate, the negative plate and a diaphragm are laminated in a Z shape to form a lithium battery core package, then the positive plate is welded on a tab welding part (a position-recording positive tab welding part) which extends out of the lithium battery core package and is integrated with a current collector of the positive plate, the negative plate is welded on a tab welding part (a position-recording positive tab welding part) which extends out of the lithium battery core package and is integrated with a current collector of the negative plate, and then the lithium ion battery is obtained by a series of process methods such as casing, packaging, baking, liquid injection, standing, formation, aging, capacity division and the like. The positive plate, the negative plate, the diaphragm and the electrolyte are sealed in the aluminum-plastic film shell, one ends of the positive lug and the negative lug, which are welded with the positive lug welding part and the negative lug welding part, are also sealed in the aluminum-plastic film shell, and the other ends of the positive lug and the negative lug extend out of the aluminum-plastic film shell to be used as electrodes of the lithium ion battery.
The inventor is carrying out the utility model discloses an in-process discovery, at the welding back of anodal ear, negative pole ear, at the welding back, though there is the action of flattening to the welding seal district, nevertheless inevitable still will leave certain welding slag and burr etc. and welding slag and burr pollute electrolyte and impale lithium ion battery's inlayer plastic-aluminum membrane easily, bring danger.
Referring to fig. 1, in order to solve the above-mentioned technical problems, in the prior art, after a tab 3 is welded to a tab welding portion 4, a high temperature adhesive tape 2 is further attached to a welding print area 1 of the tab 3 to protect the welding print area 1. However, the inventor finds that the following defects exist in the prior art in the process of research of the invention: the solid glue layer in the high-temperature adhesive tape 2 with the thickness of about 50um is only about 25um, and when the adhesive tape 2 and the welding and printing area 1 are displaced, burrs and welding slag on the surface of the welding and printing area 1 easily pierce through the high-temperature adhesive tape 2, so that the high-temperature adhesive tape 2 is difficult to protect in practical application.
Disclosure of Invention
An object of the embodiment of the utility model is to provide a lithium ion battery core package and lithium ion battery, use this technical scheme to be favorable to improving the protection that the seal district was welded to the antipodal ear weld part, avoid welding the welding slag corrosion of seal district department to weld the seal district, puncture high temperature glue to and avoid because the welding slag drops and welding slag or burr pierce through the short circuit that inner layer plastic-aluminum membrane etc. caused, and then improve lithium ion battery's security and stability.
In a first aspect, a lithium ion battery core package provided by an embodiment of the present invention includes a stacked body composed of a positive plate, a negative plate, and a separator disposed between any adjacent positive plate and negative plate,
on the laminated body, the positive electrode tab welding parts extending out of the laminated body and respectively connected with the current collectors of the positive electrode sheets are laminated together, one surface of the laminated positive electrode tab welding part is welded with a positive electrode tab,
the negative electrode tab welding parts extending out of the laminated body and respectively connected with the current collectors of the negative electrode sheets are laminated together, one surface of the laminated negative electrode tab welding part is welded with a negative electrode tab,
anodal ear, negative pole ear are in the surface in the seal district that welds in anodal ear welding part, the negative pole ear welding part coats respectively and has solidification of fluid form to glue, the solidification of fluid form is glued and is covered completely weld the seal district, the solidification of fluid form is glued the surface solidification in weld the seal district become with weld the seal district and connect solidification colloid as an organic whole, it wraps completely in the solidification colloid to weld the seal district.
Optionally, the cured gel has a thickness greater than or equal to 40um, less than or equal to 80 um.
Optionally, the width of the solidified colloid on the welding area of the positive tab is narrower than the width of the positive tab and the positive tab welding part; and/or the presence of a gas in the gas,
the width of the solidified colloid on the welding area of the negative electrode tab is narrower than the width of the welding part of the negative electrode tab and the negative electrode tab.
Alternatively, the positive electrode tab and the negative electrode tab are ultrasonically welded to the surfaces of the positive electrode tab welding portion and the laminated negative electrode tab welding portion, respectively.
Optionally, a metal protection sheet with a width not exceeding the width of the positive electrode tab welding part and the negative electrode tab welding part is welded on the other surface of the positive electrode tab welding part and/or the negative electrode tab welding part which are laminated together respectively,
the metal protection sheet is in respectively the surface of the seal zone that welds of positive ear weld part, negative pole ear weld part has still coated respectively solidification of fluid form and has glued, the solidification of fluid form is glued and is covered completely weld the seal zone, the solidification of fluid form is glued the surface solidification of weld the seal zone become with weld the seal zone and connect solidification colloid as an organic whole, it wraps completely in the solidification colloid to weld the seal zone.
Optionally, the cured gel has a thickness greater than or equal to 40um, less than or equal to 80 um.
Optionally, the width of the solidified colloid on the welding area of the metal protection sheet on the surface of the positive electrode lug welding part is narrower than that of the positive electrode lug welding part; and/or the presence of a gas in the gas,
the width of the solidified colloid on the welding area of the metal protection sheet on the surface of the negative electrode tab welding part is narrower than that of the negative electrode tab welding part.
Alternatively, each of the metal protective sheets 9 is ultrasonically welded to the surface of the positive electrode tab welding portion and the negative electrode tab welding portion, respectively.
In a second aspect, an embodiment of the present invention provides a lithium ion battery, including:
a shell body made of an aluminum-plastic film,
the lithium ion battery core package, the laminated body on the lithium ion battery core package, and the positive electrode tab, the negative electrode tab and one end connected with the laminated body are sealed in the aluminum plastic film shell, and the positive electrode tab, the negative electrode tab and the other end extend out of the aluminum plastic film shell;
and the electrolyte is sealed in the shell and is soaked in the lithium ion battery core package.
As can be seen from the above, according to the technical solution of the present embodiment, since the fluid-shaped curing adhesives are respectively coated on the welding seal areas on the two surfaces of the stacked positive tab welding portion and the stacked negative tab welding portion of the present embodiment, the fluid-shaped curing adhesives can freely flow on the surface of the welding connection position, burrs and welding slag are both coated in the fluid-shaped curing adhesives, after the fluid-shaped curing adhesives are cured, the curing adhesives are tightly cured and connected with the rough surface and the burrs of the welding seal area, and the burrs and the welding slag are hermetically coated in the curing adhesives and cannot escape, thereby avoiding the problems that the welding slag falls off to pollute the electrolyte and pierce the inner aluminum plastic film, and by adopting the technical solution of the present embodiment, the welding connection position of the positive tab and the negative tab is sealed under the curing adhesives and does not contact with the electrolyte, thereby avoiding the influence of the positive tab on the welding seal area due to corrosion of the electrolyte The connection stability of the negative electrode lug.
Moreover, by adopting the technical scheme of the embodiment, the width of the rapid curing adhesive coated on the two surfaces of the lug welding part can realize the comprehensive cladding protection of the welding area without exceeding the width of the lug welding part and the lug, so that the technical purpose of comprehensively cladding welding slag and burrs is achieved, and the appearance consistency of each lithium ion battery core package is favorably improved by adopting the technical scheme.
To sum up, the application of the technical scheme is favorable for improving the protection of the welding area of the lug welding part, avoids the welding slag at the welding area from corroding the welding area, puncturing high-temperature glue, and avoids short circuit caused by welding slag falling and welding slag or burr puncturing an inner-layer aluminum-plastic film and the like, thereby improving the safety and stability of the lithium ion battery.
Drawings
Fig. 1 is a perspective view illustrating a connection structure of a tab in a welding position on a tab welding part according to the prior art;
fig. 2 is a schematic structural diagram of a welding portion of a positive tab on a lithium ion battery cell package provided in this embodiment;
fig. 3 is a schematic structural diagram of a welding portion of a negative tab on a lithium ion battery cell package according to this embodiment;
fig. 4 is a schematic view of a welding structure of a metal protection sheet at a welding position of a tab on a lithium ion battery cell pack according to this embodiment.
Reference numerals:
1: a welding and printing area; 2: a high temperature adhesive tape; 3: a tab; 4: a tab welding part;
5: a positive tab welding part; 6: a negative tab welding portion; 7: a positive tab; 8: a negative tab;
9: a metal protective sheet; 11: a first welding and printing area; 12: a second welding and printing area;
13: solidifying the first colloid; 14: and curing the second colloid.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
the lithium ion battery core package provided by this embodiment mainly includes a laminated body, where the laminated body mainly includes a positive plate, a negative plate, and a diaphragm spaced between the positive plate and the negative plate, where the diaphragm may be an independent diaphragm layer, or may also be a long-sheet-shaped diaphragm Z-shaped spaced between each adjacent positive plate and negative plate, where the width of the negative plate is slightly wider than the width of the positive plate, and the width of the diaphragm is equal to or slightly larger than the width of the negative plate.
As shown in fig. 2, a positive tab welding portion 5 (the current collector is exposed outside for welding the positive tab 7) extending outside the lamination body and integrated with the current collector of the positive tab is reserved outside the active material coating area of each positive tab, and after lamination, the positive tab welding portions 5 are laminated together to form a whole.
Referring to fig. 3, a negative electrode tab welding portion 6 (exposed outside of the current collector for welding the negative electrode tab 8) extending outside the lamination body and integrated with the current collector of the negative electrode tab is reserved outside the active material coating area of each negative electrode tab, and after lamination, the negative electrode tab welding portions 6 are laminated together to form a whole.
In the laminate, the positive electrode tab welding portion 5 and the negative electrode tab welding portion 6 may protrude from different ends of the laminate, respectively; the positive electrode tab and the negative electrode tab may be separated from each other by extending from the same end of the laminate and spacing a predetermined distance between the positive electrode tab welding portion 5 and the negative electrode tab welding portion 6 at the end.
A positive electrode tab 7 for drawing out a positive electrode as a lithium ion battery is welded to one surface of the positive electrode tab welding portion 5 which is laminated together, and a negative electrode tab 8 for drawing out a negative electrode as a lithium ion battery is welded to one surface of the negative electrode tab welding portion 6 which is laminated together.
The surfaces of the welding seal areas 11 of the positive electrode lug 7 and the negative electrode lug 8 on the positive electrode lug welding part 5 and the negative electrode lug welding part 6 are respectively coated with liquid or pasty fluid curing glue, the fluid curing glue has fluidity, so the fluid curing glue is leveled on the surface of the welding seal areas 11, burrs and welding slag on the surface of the welding seal areas 11 are immersed in the fluid curing glue, the fluid curing glue is rapidly cured into a curing glue body 13 connected with the welding seal areas 11 into a whole, and the curing glue body 13 tightly coats the welding seal areas 11 of the positive electrode lug 7 and the negative electrode lug 8.
As an illustration of the present embodiment, the present embodiment is preferably, but not limited to, welding the positive electrode tab 7 and the negative electrode tab 8 to the surfaces of the positive electrode tab welding portion 5 and the negative electrode tab welding portion 6, respectively, by ultrasonic welding.
For the sake of convenience, the surface of the positive electrode tab 7 and the negative electrode tab 8 on the positive electrode tab welding portion 5 and the welding area one 11 on the negative electrode tab welding portion 6 laminated together is referred to as a first surface, and the other surface opposite to the first surface of the positive electrode tab welding portion 5 and the negative electrode tab welding portion 6 laminated together is referred to as a second surface.
In order to prevent the tab welding portion (hereinafter referred to as the tab welding portion including the positive tab welding portion and the negative tab welding portion) and the pole piece from being damaged due to the tab (hereinafter referred to as the tab including the positive tab and the negative tab) welding, as shown in fig. 4, a metal protection sheet 9 is further pre-welded to the second surfaces of the positive tab welding portion 5 and the negative tab welding portion 6, which are laminated together, respectively, before the tab welding.
The welding zone of the metal protection sheet 9 on the second surface of the laminated positive electrode tab welding part 5 and the laminated negative electrode tab welding part 6 is shown as a second welding zone 12 in fig. 4, the width of the metal protection sheet 9 is generally equal to or slightly narrower than the width of the tab welding part, and the width dimension of the metal protection sheet 9 is substantially the same as the dimension of the first welding zone 11 of the tab.
As an illustration of the present embodiment, it is preferable to use a metal foil sheet having the same material as the tab welding portion where the metal protection sheet 9 is located, for example, a metal sheet having the same material as the current collector of the positive electrode sheet is used as the metal protection sheet 9 on the tab welding portion 5; on the negative electrode tab welding portion 6, a metal sheet made of the same material as the negative electrode sheet current collector material is used as the metal protection sheet 9.
In the case of welding the protective sheets, it is preferable to weld the respective metal protective sheets 9 to the second surfaces of the positive electrode tab welding portion 5 and the negative electrode tab welding portion 6 laminated together in advance by a low-power ultrasonic welding process. In this way, when the positive electrode tab 7 and the negative electrode tab 8 are welded, the positive electrode tab 7 and the negative electrode tab 8 are respectively welded at the positions opposite to the metal protection sheets 9 on the first surfaces of the positive electrode tab welding part 5 and the negative electrode tab welding part 6 which are laminated together, and the technical scheme that the metal protection sheets 9 are respectively pre-welded on the second surfaces of the positive electrode tab welding part 5 and the negative electrode tab welding part 6 which are laminated together is adopted, so that the damage of the tab welding to the tab welding part and the pole piece is favorably avoided.
Referring to fig. 4, as a schematic illustration of the present embodiment, the metal protection sheet 9 is further coated with a liquid or paste-like curing adhesive at the second welding region 12 of the second surface of the stacked positive electrode tab welding portion 5 and the stacked negative electrode tab welding portion 6, and the liquid or paste-like curing adhesive has fluidity and thus flows on the surface of the second welding region 12, so that the burrs and welding slag on the surface of the second welding region 12 are immersed in the liquid curing adhesive, the liquid curing adhesive is rapidly cured into a second curing adhesive 14 integrally connected with the second welding region 12, and the second curing adhesive 14 tightly coats the second welding region 12 of the positive electrode tab 7 and the negative electrode tab 8.
As an indication of this embodiment, the fluid-like curing glue coated on the first surface and the second surface of the stacked positive electrode tab welding portion 5 and the stacked negative electrode tab welding portion 6 only covers the corresponding welding mark area 11 and the welding mark area 12 completely, and the curing glue 13 and the curing glue 14 do not need to exceed the width of the tab and tab welding portions, so that the external dimension of the lithium ion battery core package is more standard, and the structural consistency of the lithium ion battery core package is improved.
As an illustration of the present embodiment, the fast curing adhesive used in the present embodiment is resistant to electrolyte corrosion and high temperature, for example, but not limited to, the fast curing adhesive with temperature resistance range of-40 ℃ to 350 ℃, good mechanical strength, high electrochemical window, and electrolyte corrosion resistance is selected. Any one or a composite of several of the following materials can be used as the curing glue: high-temperature silicone, polyacrylic and organic silicon pressure-sensitive rapid curing adhesive.
As an illustration of the present embodiment, the liquid coating method of the fluid-shaped curing glue of the present embodiment can be implemented by, but not limited to, a method of flattening after dispensing according to the sizes of the current first solder printing area 11 and the current second solder printing area 12, or a method of applying glue at the solder position, so that the surface of the cured glue body is in a smooth planar shape. The glue coating amount is such that the first welding area 11 and the second welding area 12 are completely coated after glue coating, and the glue coating thickness is between 40 and 80 um.
After the positive tab 7 and the negative tab 8 are welded and the rapid curing adhesive is coated on the first welding print area 11 and the second welding print area 12, respectively, a lithium ion battery core package is obtained, namely, the aluminum plastic film shell of the lithium ion battery can be packaged, electrolyte is injected and formed according to the prior art, so that the lithium ion battery is obtained, and the specific processes of aluminum plastic film packaging, electrolyte injection, formation and the like can refer to the prior art.
In the lithium ion battery, a lamination body is sealed in an aluminum plastic film shell, electrolyte is soaked in the lamination body, one ends of a positive lug 7 and a negative lug 8 which are connected with a lithium ion battery core package are sealed in the aluminum plastic film shell, and the other ends of the positive lug 7 and the negative lug 8 extend out of the aluminum plastic film shell to serve as an external electrode.
In the research process of the invention, the invention discovers that the technical scheme of sticking the high-temperature adhesive tape at the welding part of the tab and the welding area of the tab in the prior art shown in fig. 1 is adopted, because the connection between the high-temperature adhesive tape 2 and the welding area 1 is surface-to-surface bonding connection, and even if the welding area 1 is flattened, the high-temperature adhesive tape is relatively rough and has burrs, and welding slag is avoided, which affects the bonding tightness between the high-temperature adhesive tape 2 and the surface of the welding area 1, causes loose adhesion and even falling off, and the welding slag in the high-temperature adhesive tape easily falls off to cause electrolyte pollution or the welding slag pierces an inner-layer aluminum-plastic film to cause short circuit;
particularly, when the welding slag is more, the adhesion degree between the high-temperature adhesive tape 2 and the welding printing area 1 is easier to reduce, so that the risks that the welding slag falls off to pollute the electrolyte and pierce the inner-layer aluminum-plastic film are further increased;
in addition, by adopting the scheme of the high-temperature adhesive tape 2 in the prior art, when the tab is subjected to external force, the high-temperature adhesive tape 2 is easy to displace relative to the welding area 1, welding slag and burrs in the high-temperature adhesive tape easily pierce the adhesive tape, and the protective effect of the high-temperature adhesive tape 2 is caused to actually fail.
However, according to the technical solution of the present embodiment, the welding connection positions of the positive electrode tab welding portion 5 and the negative electrode tab welding portion 6 stacked together in the present embodiment are sealed in the first solidified colloid 13 and the second solidified colloid 14, so as to prevent the welding slag from falling off to pollute the electrolyte and pierce the inner aluminum plastic film, because the first solidified colloid 11 and the second solidified colloid 12 are coated with the fluid-shaped solidified glue, the fluid-shaped solidified glue can freely flow on the surface of the welding connection position, so as to coat the burrs and the welding slag in the fluid-shaped solidified glue, and after the fluid-shaped solidified glue is solidified into a solid state, the first solidified colloid 13 and the second solidified colloid 14 are tightly solidified and connected with the rough surface and the burrs of the first solidified colloid 11 and the second solidified colloid 12, and the burrs and the welding connection position of the positive electrode tab 7 and the negative electrode tab 8 are sealed in the first solidified colloid 13 and the solidified colloid 14, so as to prevent the welding slag from falling off to pollute the electrolyte and pierce the inner aluminum, Under the second solidified colloid 14, the second solidified colloid is not contacted with the electrolyte, so that the technical problem that the electrolyte corrodes the first welding and printing area 11 and the second welding and printing area 12 to influence the connection stability of the positive electrode tab 7 and the negative electrode tab 8 is solved.
Moreover, by adopting the technical scheme of the embodiment, the width of the rapid curing adhesive coated on the two surfaces of the tab welding part can realize the technical purpose of comprehensively coating welding slag and burrs by comprehensively coating the welding print area I11 and the welding print area II 12 without exceeding the width of the tab welding part and the tab, so that the technical scheme is favorable for improving the appearance consistency of each lithium ion battery core package.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (9)
1. A lithium ion battery core package is characterized by comprising a laminated body consisting of a positive plate, a negative plate and a diaphragm which is arranged between any adjacent positive plate and negative plate at intervals,
on the laminated body, the positive electrode tab welding parts extending out of the laminated body and respectively connected with the current collectors of the positive electrode sheets are laminated together, one surface of the laminated positive electrode tab welding part is welded with a positive electrode tab,
the negative electrode tab welding parts extending out of the laminated body and respectively connected with the current collectors of the negative electrode sheets are laminated together, one surface of the laminated negative electrode tab welding part is welded with a negative electrode tab,
anodal ear, negative pole ear are in the surface in the seal district that welds in anodal ear welding part, the negative pole ear welding part coats respectively and has solidification of fluid form to glue, the solidification of fluid form is glued and is covered completely weld the seal district, the solidification of fluid form is glued the surface solidification in weld the seal district become with weld the seal district and connect solidification colloid as an organic whole, it wraps completely in the solidification colloid to weld the seal district.
2. The lithium ion battery cell package of claim 1,
the thickness of the solidified colloid is more than or equal to 40um and less than or equal to 80 um.
3. The lithium ion battery cell package of claim 1,
the width of the solidified colloid on the welding area of the positive lug is narrower than the width of the welding part of the positive lug and the positive lug; and/or the presence of a gas in the gas,
the width of the solidified colloid on the welding area of the negative electrode tab is narrower than the width of the welding part of the negative electrode tab and the negative electrode tab.
4. The lithium ion battery cell package of claim 1,
and the positive electrode tab and the negative electrode tab are respectively welded on the surfaces of the positive electrode tab welding part and the laminated negative electrode tab welding part in an ultrasonic mode.
5. The lithium ion battery cell package of claim 1,
a metal protection sheet with the width not exceeding the width of the positive electrode tab welding part and the negative electrode tab welding part is respectively welded on the other surface of the positive electrode tab welding part and/or the negative electrode tab welding part which are laminated together,
the metal protection sheet is in respectively the surface of the seal zone that welds of positive ear weld part, negative pole ear weld part has still coated respectively solidification of fluid form and has glued, the solidification of fluid form is glued and is covered completely weld the seal zone, the solidification of fluid form is glued the surface solidification of weld the seal zone become with weld the seal zone and connect solidification colloid as an organic whole, it wraps completely in the solidification colloid to weld the seal zone.
6. The lithium ion battery cell package of claim 5,
the thickness of the solidified colloid is more than or equal to 40um and less than or equal to 80 um.
7. The lithium ion battery cell package of claim 5,
the width of the solidified colloid on the welding area of the metal protection sheet on the surface of the positive electrode lug welding part is narrower than that of the positive electrode lug welding part; and/or the presence of a gas in the gas,
the width of the solidified colloid on the welding area of the metal protection sheet on the surface of the negative electrode tab welding part is narrower than that of the negative electrode tab welding part.
8. The lithium ion battery cell package of claim 5,
and the protective sheets are respectively welded on the surfaces of the positive electrode lug welding part and the negative electrode lug welding part in an ultrasonic mode.
9. A lithium ion battery, comprising:
a shell body made of an aluminum-plastic film,
the lithium ion battery cell package of any one of claims 1 to 8, wherein the laminate on the lithium ion battery cell package, and the positive tab, the negative tab and one end connected to the laminate are sealed in the aluminum-plastic film casing, and the positive tab, the negative tab and the other end protrude out of the aluminum-plastic film casing;
and the electrolyte is sealed in the shell and is soaked in the lithium ion battery core package.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922502390.3U CN211556028U (en) | 2019-12-31 | 2019-12-31 | Lithium ion battery core pack and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112563574A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Packaging method for reducing poor insulation of soft package lithium battery |
| CN112563580A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Manufacturing method of soft-package lithium battery capable of improving poor insulation |
| CN114023970A (en) * | 2021-10-29 | 2022-02-08 | 蜂巢能源科技有限公司 | Current collector welding method and system |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112563574A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Packaging method for reducing poor insulation of soft package lithium battery |
| CN112563580A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Manufacturing method of soft-package lithium battery capable of improving poor insulation |
| CN112563580B (en) * | 2020-11-30 | 2022-06-03 | 合肥国轩高科动力能源有限公司 | Manufacturing method of soft-package lithium battery capable of improving poor insulation |
| CN114023970A (en) * | 2021-10-29 | 2022-02-08 | 蜂巢能源科技有限公司 | Current collector welding method and system |
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